Microphone unit with internal A/D converter
First Claim
1. A microphone assembly comprising a microphone assembly casing having a sound inlet port, a transducer for receiving acoustic waves through the sound inlet port, and for converting received acoustic waves to analog audio signals, said transducer being positioned within the microphone assembly casing, an electronic circuit positioned within the microphone assembly casing, said electronic circuit comprising a pre-amplifier having an input and an output terminal, the input terminal being connected to the transducer so as to receive analog audio signals from the transducer, and an analog-to-digital converter having an input and an output terminal, the input terminal being connected to the output terminal of the pre-amplifier so as to receive amplified analog audio signals from the pre-amplifier and to convert said amplified analog audio signals to digital audio signals.
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Abstract
The present invention relates to a microphone assembly comprising a microphone assembly casing having a sound inlet port and a transducer for receiving acoustic waves through the sound inlet port. The transducer converts the received acoustic waves to analog audio signals. The assembly according to the present invention further comprises an electronic circuit positioned within the microphone assembly casing, said electronic circuit comprising a pre-amplifier and an analog-to-digital converter preferably in form of a sigma-delta modulator so as to convert amplified analog audio signals to digital audio signals.
99 Citations
34 Claims
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1. A microphone assembly comprising
a microphone assembly casing having a sound inlet port, a transducer for receiving acoustic waves through the sound inlet port, and for converting received acoustic waves to analog audio signals, said transducer being positioned within the microphone assembly casing, an electronic circuit positioned within the microphone assembly casing, said electronic circuit comprising a pre-amplifier having an input and an output terminal, the input terminal being connected to the transducer so as to receive analog audio signals from the transducer, and an analog-to-digital converter having an input and an output terminal, the input terminal being connected to the output terminal of the pre-amplifier so as to receive amplified analog audio signals from the pre-amplifier and to convert said amplified analog audio signals to digital audio signals.
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19. A method of processing received acoustical signals, said method comprising the steps of
receiving acoustical signals within a microphone casing, converting the received acoustical signals to analog audio signals within the microphone casing, amplifying the converted analog audio signals within the microphone casing, and converting the amplified analog audio signals to digital audio signals within the microphone casing.
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26. A microphone assembly comprising
a microphone assembly casing having a first and a second sound inlet port, a first transducer for receiving acoustic waves through the first sound inlet port, and for converting received acoustic waves to analog audio signals, said first transducer being positioned within the microphone assembly casing, a second transducer for receiving acoustic waves through the second sound inlet port, and for converting received acoustic waves to analog audio signals, said second transducer being positioned within the microphone assembly casing, an electronic circuit positioned within the microphone assembly casing, said electronic circuit comprising a pre-amplifier module having input and output terminals, a first input terminal being connected to the first transducer, a second input terminal being connected to the second transducer and an analog-to-digital converter module having input and output terminals, a first input terminal being connected to a first output terminal of the pre-amplifier, a second input terminal being connected to a second output terminal of the preamplifier.
Specification